ninpo spells remaining at the end, and the amount of cash collected. Players can compare their scores on online ranking boards. Ninja Gaiden Black Tecmo announced at E3 2005 that Team Ninja was working on Ninja Gaiden Black, and later exhibited a working version of the game at the TGS 2005. Black is a reworked compilation of the original Ninja Gaiden and the two Hurricane Packs. The game features new foes, such as exploding bats and doppelgänger fiends who can imitate Ryu. It contains more costumes than the original, and swaps Ninja Gaiden's unlockable NES games for an arcade version. One key feature of this version is its two new difficulty settings—the easy Ninja Dog and the very hard Master Ninja. Itagaki added Ninja Dog after receiving complaints of Ninja Gaiden being too hard in its default incarnation, although he believed that, with persistence, any player was capable of completing the game. Hence he ensured that those players selecting Ninja Dog would be subjected to gentle mockery by the game—players on this difficulty setting receive colored ribbons as accessories, and Ayane treats Ryu as an inferior. In compensation, Itagaki made the other difficulty settings harder than in Ninja Gaiden. Another feature of Black is its Mission Mode, which comprises 50 combat missions, one of which is adapted from the custom game designed for the Ninja Gaiden Master Tournament World Championship final. The last five missions are based on those in Hurricane Pack 2 and form a linked series known as "Eternal Legend". While most of the improvements made in the Hurricane Packs carried forward through this game, including the camera system tweaks and new boss battles, the Intercept maneuver, introduced in Hurricane Pack 1, was not included in Black, adding to its increased challenge.Ninja Gaiden Black was also available through Xbox's Game Pass for Xbox One S and Xbox One X, but was removed in September 2019. Ninja Gaiden Black is also enhanced for the Xbox One X console, which improves the game's resolution to 4K UHD-levels. Ninja Gaiden Sigma In 2006, Tecmo and Sony announced the development of Ninja Gaiden Sigma for the PlayStation 3. Eidos obtained the European publishing rights for this game. Itagaki had no direct role in Sigma and judged it a flawed game, although he acknowledged that Sigma gave PlayStation owners a taste of Ninja Gaiden. The gameplay for Sigma is very similar to the